Surely all that is needed is a rational conversation with the tenant when he or she moves in. The conversation could go like this:
LL : As you can see, there's lots of storage space, but some of it is above normal head height. It's probably not practical to be accessing those high cupboards on a daily basis, but if you want to use them to store stuff you rarely use, you might like to borrow my stepladders/step-up stool, or provide your own. Is that OK?
T : Yes, that's fine, thanks.
T : Actually, I don't really need to use them anyway.
If the tenant has mobility difficulties or is frail, then you would offer to put/help put their stuff in there yourself (assuming you are able), on the understanding that you would not want to be doing that frequently.
If the cupboards are a spacious as OP makes them sound then the accessible lower half is probably enough for the average single resident of a room in an HMO anyway.
Your only other practical option if you are really worried about being sued is to fit locks to the upper cupboards and not allow them to be used. Seem a bit ridiculous though.
'Pause you who read this, and think for a moment of the long chain of iron or gold, of thorns or flowers, that would never have bound you, but for the formation fo the first link on one memorable day'. Charles Dickens, Great Expectations